Common round transformation operation unit, common round transformation circuit and AES decryption circuit
A technology of arithmetic unit and conversion circuit, which is applied in the field of cryptographic circuits to achieve the effect of reducing the implementation area
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[0036]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0037] The AES decryption circuit is composed of the following operation units, including: an inverse byte replacement operation unit, a key addition operation unit, an inverse column mixing operation unit and a reverse row shift operation unit.
[0038] The AES round transform operates in the form of a matrix. The decryption algorithm regards the input 128-bit packet data as a 4×4 byte matrix, and each matrix element is 1 byte. The intermediate result of the round transformation is called the state matrix and is a 4×4 byte matrix. Assume that the state matrix of the normal round transformation inp...
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